BIO172W08Lec27CT - Biology 172 Lecture 27- Pattern...

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Lecture 27- Pattern Formation II: Chordates March 19, 2008 Today’s Outline 1. Animal Body Plan - Germ layers - 2. Gastrulation - Protostomes & Deuterostomes - Cell movements - Induction & the Organizer 3. Cell determination 4. Embryonic and somatic (‘adult’) stem cells Announcements Discussion this week: Stem Cells – Read article by Clark Biology 172
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Animal Body Plan = Architectural Design 1. Number of germ layers giving rise to distinct tissue types (three vs. two) 2. Type of body symmetry (radial vs. bilateral) 3. Presence or absence of body cavity ( coelom ) 4. Pattern of gastrulation (formation of germ layers, mouth and anus)
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Animal Phylogeny
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Three Germ Layers: Ectoderm Mesoderm Endoderm “Tube-in-a tube” design Cavity in mesoderm = coelom
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Radial vs. Bilateral Symmetry Bilateral Symmetry >> Three Primary Body Axes
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“mouth first” vs. Deuterostome
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This note was uploaded on 12/06/2009 for the course BIO 172 taught by Professor Clark during the Winter '08 term at University of Michigan.

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BIO172W08Lec27CT - Biology 172 Lecture 27- Pattern...

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